This is what the source video here suggests: https://youtu.be/Sm8BIV5SYsM?t=398. Here I am suggesting only have snake juice for 72 hours to get one’s body into autophagy. He talks about the correlation between increasing autophagy and increasing fasting time at 6:38, which is where the link for the video begins.
Here’s a legitimate scientific answer. TLDR; autophagy accelerates to its maximum potential after 48 hours. This particular page doesn’t specify when it begins to decline again, but I’ve read that it begins to fall again on day 7. I’ll see if I can find that article again, if so I’ll make an edit.
Honestly the guy in the video is probably more qualified to answer that question than anyone that’s going to be reading this sub. He’s done a ton of research and I would go with his opinion in most cases.
Yes check out Valter Longo; the Edna M. Jones Professor of Gerontology and Biological Sciences and Director of the Longevity Institute at the University of Southern California.
Most of his research is focused on ways to mimic the bodies fasting response to trigger autophagy.